<template>
	<div>
		<!-- 面包屑导航区 -->
		<el-breadcrumb separator-class="el-icon-arrow-right">
			<el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
			<el-breadcrumb-item>商品管理</el-breadcrumb-item>
			<el-breadcrumb-item>参数列表</el-breadcrumb-item>
		</el-breadcrumb>
	<!-- 卡片视图 -->
		<el-card>
			<!-- 警告区域 -->
			<el-alert title="注意：只允许为第三级分类设置相关参数！" type="warning" show-icon :closable="false"></el-alert>
			<!-- 选择商品分类区域 -->
			<el-row class="cat_opt">
				<el-col>
					<span>选择商品分类：</span>
					<!-- 商品分类的级联选择框 -->
					<el-cascader v-model="selectedCateKeys" :options="cateList" :props="cateProps" @change="handleChange"></el-cascader>
				</el-col>
			</el-row>
			<!-- tab页签区域 -->
			<el-tabs v-model="activeTabsName" @tab-click="handleTabsClick">
				<!-- 添加动态参数面板 -->
				<el-tab-pane label="动态参数" name="many">
					<el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
					<!-- 动态参数表格 -->
					<el-table :data="manyTableData" border stripe>
						<!-- 展开列 -->
						<el-table-column type="expand">
							<template slot-scope="scope">
							<el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
								<!-- 输入Tag文本框 -->
								<el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput"
								 size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)"></el-input>
								<el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
							</template>
						</el-table-column>
						<!-- 索引列 -->
						<el-table-column label="#" type="index"></el-table-column>
						<el-table-column label="参数名称" prop="attr_name"></el-table-column>
						<el-table-column>
							<template slot-scope="scope">
							<el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
								<el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
							</template>
						</el-table-column>
					</el-table>
				</el-tab-pane>
				<!-- 添加静态属性面板 -->
				<el-tab-pane label="静态属性" name="only">
					<el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
					<!-- 静态属性表格 -->
					<el-table :data="onlyTableData" border stripe>
						<!-- 展开列 -->
					<el-table-column type="expand">
							<template slot-scope="scope">
								<el-tag v-for="(item, i) in scope.row.attr_vals" 
								:key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
								<!-- 输入Tag文本框 -->
								<el-input class="input-new-tag" 
								v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput"
								 size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)"></el-input>
								<el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
							</template>
						</el-table-column>
						<!-- 索引列 -->
						<el-table-column type="index"></el-table-column>
						<el-table-column label="属性名称" prop="attr_name"></el-table-column>
					<el-table-column>
							<template slot-scope="scope">
								<el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
								<el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
							</template>
						</el-table-column>
					</el-table>
				</el-tab-pane>
			</el-tabs>
		</el-card>
		<!-- 添加参数对话框 -->
		<el-dialog :title=" '添加' + getTitleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
			<el-form :model="addFrom" :rules="addFromRules" ref="addFromRef" label-width="100px">
				<el-form-item :label="getTitleText" prop="attr_name">
					<el-input v-model="addFrom.attr_name"></el-input>
				</el-form-item>
			</el-form>
			<span slot="footer" class="dialog-footer">
				<el-button @click="addDialogVisible = false">取 消</el-button>
				<el-button type="primary" @click="addParams">确 定</el-button>
			</span>
		</el-dialog>
		<!-- 编辑参数对话框 -->
		<el-dialog :title=" '修改' + getTitleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
			<el-form :model="editFrom" :rules="editFromRules" ref="editFromRef" label-width="100px">
				<el-form-item :label="getTitleText" prop="attr_name">
					<el-input v-model="editFrom.attr_name"></el-input>
				</el-form-item>
			</el-form>
			<span slot="footer" class="dialog-footer">
				<el-button @click="editDialogVisible = false">取 消</el-button>
				<el-button type="primary" @click="editParams">确 定</el-button>
			</span>
		</el-dialog>
	</div>
</template>
<script>
	export default {
		data() {
			return {
				// 商品分类列表
				cateList: [],
				//   级联选择框的配置对象
				cateProps: {
					expandTrigger: 'hover',
					value: 'cat_id',
					label: 'cat_name',
					children: 'children'
				},
				//   级联选择框双向绑定对象
				selectedCateKeys: [],
				//   激活页签名称
				activeTabsName: 'many',
				//   动态参数数据
				manyTableData: [],
				//   静态属性数据
				onlyTableData: [],
				//   控制添加参数对话框的显示与隐藏
				addDialogVisible: false,
				//   添加表单的数据对象
				addFrom: {
					attr_name: ''
				},
				//   添加表单的验证规则
				addFromRules: {
					attr_name: [
						{
							required: true,
							message: '请输入参数名称',
							trigger: 'blur'
						}
					]
				},
				//   编辑对话框
				editDialogVisible: false,
				//   修改表单数据对象
				editFrom: {},
				//   修改表单验证规则
				editFromRules: {
					attr_name: [
						{
							required: true,
							message: '请输入参数名称',
							trigger: 'blur'
						}
					]
				}
			}
		},
		created() {
			this.getCateList()
		},
		computed: {
			//   按钮需要被禁用返回true, 否则返回false
			isBtnDisabled() {
				if (this.selectedCateKeys.length !== 3) {
				return true
				}
				return false
			},
			// 当前选中的三级分类Id
			getCateId() {
				if (this.selectedCateKeys.length === 3) {
					return this.selectedCateKeys[2]
				}
				return null
			},
			getTitleText() {
				if (this.activeTabsName === 'many') {
					return '动态参数'
				}
				return '静态属性'
			}
		},
		methods: {
			//   获取所有的商品分类列表
			async getCateList() {
				const {
					data: res
				} = await this.$http.get('categories')
				if (res.meta.status !== 200) {
					return this.$message.error('获取商品数据列表失败！')
				}
				this.cateList = res.data
			},
			// 级联选择框 选中变化 触发
			handleChange() {
				this.getParamsData()
			},
			// Tab页签点击事件的处理函数
			handleTabsClick() {
				this.getParamsData()
			},
			// 获取参数的列表数据
			async getParamsData() {
				// 只允许选择三级分类：
				// 通过数组的长度判断
				if (this.selectedCateKeys.length !== 3) {
					this.selectedCateKeys = []
					// 清空表格数据
					this.manyTableData = []
					this.onlyTableData = []
					return
				}
				//   根据所选分类的Id,和当前面板的参数, 获取对应的参数
				const {
					data: res
				} = await this.$http.get(
					`categories/${this.getCateId}/attributes`,
					{
						params: {
							sel: this.activeTabsName
						}
					}
				)
				if (res.meta.status !== 200) {
				return this.$message.error('获取参数列表失败！')
				}
				res.data.forEach(item => {
					//   通过三元表达式判断attr_vals是否为空
					item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
					// 控制文本框的显示与隐藏
					item.inputVisible = false
					// 文本框的输入值
					item.inputValue = ''
				})
				if (this.activeTabsName === 'many') {
					this.manyTableData = res.data
				} else {
					this.onlyTableData = res.data
				}
			},
			// 监听对话框的关闭事件
			addDialogClosed() {
			this.$refs.addFromRef.resetFields()
			},
			// 添加参数
			addParams() {
				this.$refs.addFromRef.validate(async valid => {
					if (!valid) return
					const {
						data: res
					} = await this.$http.post(
						`categories/${this.getCateId}/attributes`,
						{
							attr_name: this.addFrom.attr_name,
							attr_sel: this.activeTabsName
						}
					)
					if (res.meta.status !== 201) {
						return this.$message.error('添加参数失败！')
					}
					this.$message.success('添加参数成功！')
					this.addDialogVisible = false
					this.getParamsData()
				})
			},
			// 显示编辑对话框
			async showEditDialog(attrId) {

				const {
					data: res
				} = await this.$http.get(

					`categories/${this.getCateId}/attributes/${attrId}`,

					{
						params: {
							attr_sel: this.activeTabsName
						}
					}
				)
				if (res.meta.status !== 200) {
					return this.$message.error('获取分类失败！')
				}
				this.editFrom = res.data
				this.editDialogVisible = true
			},
			// 重置修改表单
			editDialogClosed() {
				this.$refs.editFromRef.resetFields()
			},
			// 修改参数
			editParams() {
				this.$refs.editFromRef.validate(async valid => {
					if (!valid) return
					const {
						data: res
					} = await this.$http.put(
						`categories/${this.getCateId}/attributes/${this.editFrom.attr_id}`,
						{
							attr_name: this.editFrom.attr_name,
							attr_sel: this.activeTabsName
						}
					)
					if (res.meta.status !== 200) {
						return this.$message.error('修改参数失败！')
					}
					this.$message.success('修改参数成功！')
					this.getParamsData()
					this.editDialogVisible = false
				})
			},
			// 根据Id删除对应的参数项
			async removeParams(attrId) {
				const confirmResult = await this.$confirm(
					'此操作将永久删除该参数, 是否继续?',
					'提示',
					{
						confirmButtonText: '确定',
						cancelButtonText: '取消',
						type: 'warning'
					}
				).catch(err => err)
				if (confirmResult !== 'confirm') {
					return this.$message.info('已取消删除！')
				}
				const {
					data: res
				} = await this.$http.delete(
					`categories/${this.getCateId}/attributes/${attrId}`
				)
				if (res.meta.status !== 200) {
					return this.$message.error('删除参数失败！')
				}
				this.$message.success('删除参数成功！')
				this.getParamsData()
			},
			// 文本框失去焦点,或者按下Enter触发
			handleInputConfirm(row) {
				// 输入的内容为空时，清空
				if (row.inputValue.trim().length === 0) {
					row.inputValue = ''
					row.inputVisible = false
					return
				}
				//如果没有return 则证明输入的内容，需要做处理
				row.attr_vals.push(row.inputValue.trim())
				row.inputValue = ''
				row.inputVisible = false
				// 提交数据库，保存修改
				this.saveAttrVals(row)
			},
			// 将对attr_vals（Tag） 的操作 保存到数据库
			async saveAttrVals(row) {
				const {
					data: res
				} = await this.$http.put(
					`categories/${this.getCateId}/attributes/${row.attr_id}`,
					{
					attr_name: row.attr_name,
						attr_sel: row.attr_sel,
						attr_vals: row.attr_vals.join(' ')
					}
				)
				if (res.meta.status !== 200) {
					return this.$message.error('修改参数项失败！')
				}
				this.$message.success('修改参数项成功！')
			},
			// 点击按钮显示输入框
			showInput(row) {
				row.inputVisible = true
				//   让输入框自动获取焦点
				// $nextTick方法的作用：当页面元素被重新渲染之后，才会至指定回调函数中的代码
				this.$nextTick(_ => {
					this.$refs.saveTagInput.$refs.input.focus()
				})
			},
			// 删除对应的参数可选项
			handleClose(i, row) {
				row.attr_vals.splice(i, 1)
				this.saveAttrVals(row)
			}
		}
	}
</script>
<style Lang="less" scoped>
	.cat_opt {
		margin: 15px 0px;
	}
	.el-cascader {
		width: 25%;
	}
	.el-tag {
		margin: 8px;
	}
	.input-new-tag {
		width: 90px;
	}
	.button-new-tag {
		height: 32px;
		line-height: 30px;
		padding-top: 0;
		padding-bottom: 0;
	}
</style>
